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Old 05-23-2015, 06:53 AM   #1
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Another tire pressure TPMS question

I just installed TST 507 on rig. 6 + 2 on tow dolly.

After I installed everything it showed my pressures on the coach at 92-96 psi. I aired all coach tires up to 102 psi. three gauges confirmed. Air chuck gauge, air gauge, and regulator on compressor. Once on the way, the air pressure on all 6 coach tires was reading 109-115 on TST. Is this normal for a 10% or greater increase with warm up? The dolly tires were set to 50 psi (all three gauges} and when on way were reading 49 and 52 on the TST.
Any input appreciated.
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Old 05-23-2015, 06:55 AM   #2
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I found that % increase as well and confirmed with TST that is was normal.
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Old 05-23-2015, 07:01 AM   #3
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Yes you will see the tire pressures increase as you are driving. If you watch the system say first thing in the morning and later in the day when the sun is hitting the tires, you can see the same thing happen. Ours are set at 92 psi on all tires and reading of 110-115 psi were seen during a trip to FL when it was 95-90 degrees. During January when it was 0-5 degrees say reading down to 80 psi. First nice day and back at the 92 psi readings.
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Old 05-23-2015, 09:28 AM   #4
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I'm not sure with that TST model if it includes a temperature reading for each tire or not. If it does, watch the temperature readings. As the temperature rises, so will the air pressure...
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Old 05-23-2015, 09:45 AM   #5
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Yes, perfectly normal.
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Old 05-23-2015, 10:10 AM   #6
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Normal. You may need to set your warning alarm levels differing from the stock defaults if you are getting false alarms sometimes.
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Old 05-23-2015, 10:17 AM   #7
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Normal. You may need to set your warning alarm levels differing from the stock defaults if you are getting false alarms sometimes.

Excellent point.
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Old 05-23-2015, 12:19 PM   #8
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Left home yesterday with tires set at 95 psi for rears. After an hour of driving @70 pressure was up to 115 and high pressure alarm was going off. Totally normal.
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Old 05-23-2015, 04:28 PM   #9
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It is normal. I set my high pressure warning to 25% higher than cold inflation pressure. I'm not concerned about high pressure. Low pressure really concerns me.
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Old 05-24-2015, 03:21 AM   #10
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I have the Tst system on 6 Moho tires. the low pressure alarm is set at 85 psi. 95 psi is normal.
if I install sensors on my toad with 40 psi normal how do I set the alarm?
obviously, I do not want a low pressure alarm at 40 psi for all 10 tires.
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Old 05-24-2015, 05:43 AM   #11
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We are in the same situation, we need to raise our high-pressure alarm because the settings suggested by TST cause the alarm to go off after an hour or so of travel. Yet the temperature is not a significant concern in that rise in PSI from our experience thus far.
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Old 05-24-2015, 06:01 AM   #12
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Originally Posted by DAN L View Post
I have the Tst system on 6 Moho tires. the low pressure alarm is set at 85 psi. 95 psi is normal.
if I install sensors on my toad with 40 psi normal how do I set the alarm?
obviously, I do not want a low pressure alarm at 40 psi for all 10 tires.
You actually set the alarm for each tire as you program the system so each tire has it's own alarm settings.
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Old 05-24-2015, 09:54 AM   #13
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Actually you set the pressure alarms by axle.
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Old 05-24-2015, 10:08 AM   #14
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Yes but you have to set EACH sensor separately.


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